Sector Z (セクターＺ Sekutā Z) is a default stage appearing in Super Smash Bros. based on the Star Fox 64 level Sector Z. It is called "Sector Z" because of the red ripple in the background which resembles the letter "Z". This stage did not return in Melee but a similar stage atop the Great Fox appeared, Corneria (which subsequently reappeared in Brawl). This is the largest stage appearing in Super Smash Bros. In the 1-Player mode, the player fights Fox on this stage.
The Great Fox is the only platform on this stage but it has three different terrain levels. The front two-thirds of the ship are the first terrain with the tip of the wing acting as a good vantage point for projectile throwing. The back third of the ship near the engines and the Arwing bay is another terrain with the left wall being a good place to rack combos on another player.
Arwing fighters will occasionally fire at the players, dealing large amounts of damage and knockback. For this reason, coupled with the fact that the stage is too large, Sector Z has been banned in many tournaments. Also, a character standing on a fighter may be KO'd if the fighter flies offscreen to the top or side; however, the Arwings do tend to barrel roll or fly upside down, which essentially pushes the character off. Unlike the Arwing fighters, though, the main guns of the Great Fox do not fire.
While the stage reappeared in spirit as Corneria in Melee and Brawl, the stage was much smaller than its Super Smash Bros. incarnation, the main guns fire, and players can even camp on the main cannons or destroy them.
In tournaments, the stage is banned throughout all rulesets due to the knockback of the lasers, the excessive size which lowers KO potential heavily and promotes camping, and the lower area of the stage which allows circle camping.
This stage is from the Star Fox 64 level Sector Z. As mentioned earlier, Sector Z is a level in Star Fox 64, the fifth level when taking the hard path. The level takes place in a nebula en route to Venom when the Star Fox team and the Great Fox are ambushed by Andross' fighters who have a weapon never seen before, missiles. These missiles also appear in the background of the stage. The player must protect the Great Fox in this level from enemy fighters and missiles. Sector Z was also a multiplayer level in Star Fox 64. This area was probably chosen for the setting of this stage because it is the only stage where the Great Fox is prominently seen in its normal form and the Great Fox acts as a great platform.
Ever since the first Star Fox, Arwings have been the Star Fox team's signature craft. The Arwings have been redesigned in Star Fox 64. In this stage Arwings can be seen flying over the Great Fox. Their main attack is firing lasers. There is also an upgrade that lets the player shoot two lasers at once. The design of the Arwing are designed like they are in Star Fox 64 and they shoot the upgraded lasers.
The music used in this stage is the main theme for Star Fox 64.
 Description from the Instruction Booklet
Fox's favourite ship, Arwing, flies past and indiscriminately shoots its lasers across the stage.
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